<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Float Test</title>
    <style>
        * {
            box-sizing: border-box;
        }

        body {
            margin: 0;
        }

        .header {
            background-color: #2196F3;
            color: white;
            text-align: center;
            padding: 15px;
        }

        .footer {
            background-color: #444;
            color: white;
            text-align: center;
            padding: 15px;
        }

        .topmenu {
            list-style-type: none;
            margin: 0;
            padding: 0;
            overflow: hidden;
            background-color: #777;
        }

        .topmenu li {
            float: left;
        }

        .topmenu li a {
            display: inline-block;
            color: white;
            text-align: center;
            padding: 16px;
            text-decoration: none;
        }

        .topmenu li a:hover {
            background-color: #222;
        }

        .topmenu li a.active {
            color: white;
            background-color: #4CAF50;
        }

        .column {
            float: left;
            padding: 15px;
        }

        .clearfix::after {
            content: "";
            clear: both;
            display: inline;
        }

        .sidemenu {
            width: 25%;
        }

        .content {
            width: 75%;
        }

        .sidemenu ul {
            list-style-type: none;
            margin: 0;
            padding: 0;
        }

        .sidemenu li a {
            margin-bottom: 4px;
            display: block;
            padding: 8px;
            background-color: #eee;
            text-decoration: none;
            color: #666;
        }

        .sidemenu li a:hover {
            background-color: #555;
            color: white;
        }

        .sidemenu li a.active {
            background-color: #008CBA;
            color: white;
        }

        span {
            float: left;
            width: 2em;
            font-size: 200%;
            line-height: 70%;
        }
    </style>
</head>

<body>

    <ul class="topmenu">
        <li><a href="#home" class="active">大联大</a></li>
        <li><a href="#news">世平</a></li>
        <li><a href="#contact">ATU</a></li>
        <li><a href="#about">关于我们</a></li>
    </ul>




    <div class="column content">
        <div class="header">
            <h1>ATU</h1>
        </div>
        <h1>ATU</h1>
        <p><span>ATU</span>是大联大（深圳）有限公司世平集团的技术部门。</p>
        <p>我是 ATU 中 Synergy 部门一组的成员。</p>
    </div>


    <div class="clearfix">
        <div class="column sidemenu">
            <ul>
                <li><a href="#flight">RF</a></li>
                <li><a href="#city">MCU</a></li>
                <li><a href="#island">Power</a></li>
                <li><a href="#food">Auto</a></li>
                <li><a href="#people" class="active">Synergy</a></li>
                <li><a href="#history">IoT</a></li>
            </ul>
        </div>
    </div>
    <div class="footer" style="clear:both">
        <p>版权 ATU 专业性培训</p>
    </div>


</body>

</html>